What this 8-bit MCU brings to the BOM
The STM8S003F3P6TR is an 8-bit MCU with an STM8 core clocked at 16 MHz. It has 8 KB Flash, 1 KB RAM, and 128 bytes of EEPROM.
8 KB Flash and 1 KB RAM — firmware capacity limits
The 8 KB Flash is the hard ceiling for your compiled code. A typical UART bootloader, a few GPIO toggles, and a LIN slave stack can fit, but you won't squeeze in a full Modbus RTU master plus a graphical LCD driver. The 1 KB RAM handles a few dozen bytes of stack plus modest buffers — plan your data structures accordingly. The 128-byte EEPROM is separate from Flash, so you can store calibration or configuration data without wearing the program memory.